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UKMT Junior Mathematical Challenge, 2016

Number theory Difficulty 3.0 AMC 10/12 Find the answer United Kingdom

In the addition sum shown, each letter represents a different non-zero digit. $SEE + SEE = AXES$ (arranged as: $S\,E\,E$ plus $S\,E\,E$ equals $A\,X\,E\,S$ ). What digit does $X$ represent?

(A) $1$ (B) $3$ (C) $5$ (D) $7$ (E) $9$

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